| Term | Definition |
| checkpoints | check conditions for favorable cell division |
| 3 checkpoints | G1,G2,and metaphase |
| proteins a G1 | determine whether it is necessary for a cell to divide, they check for proteins called growth factor, if there aren't enough, division doesn't occur, is cell big enough? |
| G2checkpoint | has DNA replicated properly,is cell big enough? |
| metaphase checkpoint | have all chromosomes attached to microtubules so cell division can proceed properly |
| proteins are coded for by | genes |
| mistakes in cell division occur | when genes are altered or mutated |
| mutation | change in sequence of DNA |